text: /**
    ******************************************************************************
    * @file    stm32f2xx_gpio.c
    * @author  MCD Application Team
    * @version V1.0.0
    * @date    18-April-2011
    * @brief   This file provides firmware functions to manage the following 
    *          functionalities of the GPIO peripheral:           
    *           - Initialization and Configuration
    *           - GPIO Read and Write
    *           - GPIO Alternate functions configuration
    * 
    *  @verbatim
    *
    *          ===================================================================
    *                                 How to use this driver
    *          ===================================================================       
    *           1. Enable the GPIO AHB clock using the following function
    *                RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOx, ENABLE);
    *             
    *           2. Configure the GPIO pin(s) using GPIO_Init()
    *              Four possible configuration are available for each pin:
    *                - Input: Floating, Pull-up, Pull-down.
    *                - Output: Push-Pull (Pull-up, Pull-down or no Pull)
    *                          Open Drain (Pull-up, Pull-down or no Pull).
    *                  In output mode, the speed is configurable: 2 MHz, 25 MHz,
    *                  50 MHz or 100 MHz.
    *                - Alternate Function: Push-Pull (Pull-up, Pull-down or no Pull)
    *                                      Open Drain (Pull-up, Pull-down or no Pull).
    *                - Analog: required mode when a pin is to be used as ADC channel
    *                          or DAC output.
    * 
    *          3- Peripherals alternate function:
    *              - For ADC and DAC, configure the desired pin in analog mode using 
    *                  GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AN;
    *              - For other peripherals (TIM, USART...):
    *                 - Connect the pin to the desired peripherals' Alternate 
    *                   Function (AF) using GPIO_PinAFConfig() function
    *                 - Configure the desired pin in alternate function mode using
    *                   GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF
    *                 - Select the type, pull-up/pull-down and output speed via 
    *                   GPIO_PuPd, GPIO_OType and GPIO_Speed members
    *                 - Call GPIO_Init() function
    *        
    *          4. To get the level of a pin configured in input mode use GPIO_ReadInputDataBit()
    *          
    *          5. To set/reset the level of a pin configured in output mode use
    *             GPIO_SetBits()/GPIO_ResetBits()
    *               
    *          6. During and just after reset, the alternate functions are not 
    *             active and the GPIO pins are configured in input floating mode
    *             (except JTAG pins).
    *
    *          7. The LSE oscillator pins OSC32_IN and OSC32_OUT can be used as 
    *             general-purpose (PC14 and PC15, respectively) when the LSE
    *             oscillator is off. The LSE has priority over the GPIO function.
    *
    *          8. The HSE oscillator pins OSC_IN/OSC_OUT can be used as 
    *             general-purpose PH0 and PH1, respectively, when the HSE 
    *             oscillator is off. The HSE has priority over the GPIO function.
    *             
    *  @endverbatim        
    *
    ******************************************************************************
    * @attention
    *
    * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
    * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
    * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
    * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
    * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
    * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
    *
    * <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>
    ******************************************************************************
    */
  
  /* Includes ------------------------------------------------------------------*/
  #include "stm32f2xx_gpio.h"
  #include "stm32f2xx_rcc.h"
  
  /** @addtogroup STM32F2xx_StdPeriph_Driver
    * @{
    */
  
  /** @defgroup GPIO 
    * @brief GPIO driver modules
    * @{
    */ 
  
  /* Private typedef -----------------------------------------------------------*/
  /* Private define ------------------------------------------------------------*/
  /* Private macro -------------------------------------------------------------*/
  /* Private variables ---------------------------------------------------------*/
  /* Private function prototypes -----------------------------------------------*/
  /* Private functions ---------------------------------------------------------*/
  
  /** @defgroup GPIO_Private_Functions
    * @{
    */ 
  
  /** @defgroup GPIO_Group1 Initialization and Configuration
   *  @brief   Initialization and Configuration
   *
  @verbatim   
   ===============================================================================
                          Initialization and Configuration
   ===============================================================================  
  
  @endverbatim
    * @{
    */
  
  /**
    * @brief  Deinitializes the GPIOx peripheral registers to their default reset values.
    * @note   By default, The GPIO pins are configured in input floating mode (except JTAG pins).
    * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral.
    * @retval None
    */
  void GPIO_DeInit(GPIO_TypeDef* GPIOx)
  {
    /* Check the parameters */
    assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
  
    if (GPIOx == GPIOA)
    {
      RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOA, ENABLE);
      RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOA, DISABLE);
    }
    else if (GPIOx == GPIOB)
    {
      RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOB, ENABLE);
      RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOB, DISABLE);
    }
    else if (GPIOx == GPIOC)
    {
      RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOC, ENABLE);
      RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOC, DISABLE);
    }
    else if (GPIOx == GPIOD)
    {
      RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOD, ENABLE);
      RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOD, DISABLE);
    }
    else if (GPIOx == GPIOE)
    {
      RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOE, ENABLE);
      RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOE, DISABLE);
    }
    else if (GPIOx == GPIOF)
    {
      RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOF, ENABLE);
      RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOF, DISABLE);
    }
    else if (GPIOx == GPIOG)
    {
      RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOG, ENABLE);
      RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOG, DISABLE);
    }
    else if (GPIOx == GPIOH)
    {
      RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOH, ENABLE);
      RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOH, DISABLE);
    }
    else
    {
      if (GPIOx == GPIOI)
      {
        RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOI, ENABLE);
        RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_GPIOI, DISABLE);
      }
    }
  }
  
  /**
    * @brief  Initializes the GPIOx peripheral according to the specified parameters in the GPIO_InitStruct.
    * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral.
    * @param  GPIO_InitStruct: pointer to a GPIO_InitTypeDef structure that contains
    *         the configuration information for the specified GPIO peripheral.
    * @retval None
    */
  void GPIO_Init(GPIO_TypeDef* GPIOx, GPIO_InitTypeDef* GPIO_InitStruct)
  {
    uint32_t pinpos = 0x00, pos = 0x00 , currentpin = 0x00;
  
    /* Check the parameters */
    assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
    assert_param(IS_GPIO_PIN(GPIO_InitStruct->GPIO_Pin));
    assert_param(IS_GPIO_MODE(GPIO_InitStruct->GPIO_Mode));
    assert_param(IS_GPIO_PUPD(GPIO_InitStruct->GPIO_PuPd));
  
    /* -------------------------Configure the port pins---------------- */
    /*-- GPIO Mode Configuration --*/
    for (pinpos = 0x00; pinpos < 0x10; pinpos++)
    {
      pos = ((uint32_t)0x01) << pinpos;
      /* Get the port pins position */
      currentpin = (GPIO_InitStruct->GPIO_Pin) & pos;
  
      if (currentpin == pos)
      {
        GPIOx->MODER  &= ~(GPIO_MODER_MODER0 << (pinpos * 2));
        GPIOx->MODER |= (((uint32_t)GPIO_InitStruct->GPIO_Mode) << (pinpos * 2));
  
        if ((GPIO_InitStruct->GPIO_Mode == GPIO_Mode_OUT) || (GPIO_InitStruct->GPIO_Mode == GPIO_Mode_AF))
        {
          /* Check Speed mode parameters */
          assert_param(IS_GPIO_SPEED(GPIO_InitStruct->GPIO_Speed));
  
          /* Speed mode configuration */
          GPIOx->OSPEEDR &= ~(GPIO_OSPEEDER_OSPEEDR0 << (pinpos * 2));
          GPIOx->OSPEEDR |= ((uint32_t)(GPIO_InitStruct->GPIO_Speed) << (pinpos * 2));
  
          /* Check Output mode parameters */
          assert_param(IS_GPIO_OTYPE(GPIO_InitStruct->GPIO_OType));
  
          /* Output mode configuration*/
          GPIOx->OTYPER  &= ~((GPIO_OTYPER_OT_0) << ((uint16_t)pinpos)) ;
          GPIOx->OTYPER |= (uint16_t)(((uint16_t)GPIO_InitStruct->GPIO_OType) << ((uint16_t)pinpos));
        }
  
        /* Pull-up Pull down resistor configuration*/
        GPIOx->PUPDR &= ~(GPIO_PUPDR_PUPDR0 << ((uint16_t)pinpos * 2));
        GPIOx->PUPDR |= (((uint32_t)GPIO_InitStruct->GPIO_PuPd) << (pinpos * 2));
      }
    }
  }
  
  /**
    * @brief  Fills each GPIO_InitStruct member with its default value.
    * @param  GPIO_InitStruct : pointer to a GPIO_InitTypeDef structure which will be initialized.
    * @retval None
    */
  void GPIO_StructInit(GPIO_InitTypeDef* GPIO_InitStruct)
  {
    /* Reset GPIO init structure parameters values */
    GPIO_InitStruct->GPIO_Pin  = GPIO_Pin_All;
    GPIO_InitStruct->GPIO_Mode = GPIO_Mode_IN;
    GPIO_InitStruct->GPIO_Speed = GPIO_Speed_2MHz;
    GPIO_InitStruct->GPIO_OType = GPIO_OType_PP;
    GPIO_InitStruct->GPIO_PuPd = GPIO_PuPd_NOPULL;
  }
  
  /**
    * @brief  Locks GPIO Pins configuration registers.
    * @note   The locked registers are GPIOx_MODER, GPIOx_OTYPER, GPIOx_OSPEEDR,
    *         GPIOx_PUPDR, GPIOx_AFRL and GPIOx_AFRH.
    * @note   The configuration of the locked GPIO pins can no longer be modified
    *         until the next reset.
    * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral.
    * @param  GPIO_Pin: specifies the port bit to be locked.
    *          This parameter can be any combination of GPIO_Pin_x where x can be (0..15).
    * @retval None
    */
  void GPIO_PinLockConfig(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
  {
    __IO uint32_t tmp = 0x00010000;
  
    /* Check the parameters */
    assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
    assert_param(IS_GPIO_PIN(GPIO_Pin));
  
    tmp |= GPIO_Pin;
    /* Set LCKK bit */
    GPIOx->LCKR = tmp;
    /* Reset LCKK bit */
    GPIOx->LCKR =  GPIO_Pin;
    /* Set LCKK bit */
    GPIOx->LCKR = tmp;
    /* Read LCKK bit*/
    tmp = GPIOx->LCKR;
    /* Read LCKK bit*/
    tmp = GPIOx->LCKR;
  }
  
  /**
    * @}
    */
  
  /** @defgroup GPIO_Group2 GPIO Read and Write
   *  @brief   GPIO Read and Write
   *
  @verbatim   
   ===============================================================================
                                GPIO Read and Write
   ===============================================================================  
  
  @endverbatim
    * @{
    */
  
  /**
    * @brief  Reads the specified input port pin.
    * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral.
    * @param  GPIO_Pin: specifies the port bit to read.
    *         This parameter can be GPIO_Pin_x where x can be (0..15).
    * @retval The input port pin value.
    */
  uint8_t GPIO_ReadInputDataBit(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
  {
    uint8_t bitstatus = 0x00;
  
    /* Check the parameters */
    assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
    assert_param(IS_GET_GPIO_PIN(GPIO_Pin));
  
    if ((GPIOx->IDR & GPIO_Pin) != (uint32_t)Bit_RESET)
    {
      bitstatus = (uint8_t)Bit_SET;
    }
    else
    {
      bitstatus = (uint8_t)Bit_RESET;
    }
    return bitstatus;
  }
  
  /**
    * @brief  Reads the specified GPIO input data port.
    * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral.
    * @retval GPIO input data port value.
    */
  uint16_t GPIO_ReadInputData(GPIO_TypeDef* GPIOx)
  {
    /* Check the parameters */
    assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
  
    return ((uint16_t)GPIOx->IDR);
  }
  
  /**
    * @brief  Reads the specified output data port bit.
    * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral.
    * @param  GPIO_Pin: specifies the port bit to read.
    *          This parameter can be GPIO_Pin_x where x can be (0..15).
    * @retval The output port pin value.
    */
  uint8_t GPIO_ReadOutputDataBit(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
  {
    uint8_t bitstatus = 0x00;
  
    /* Check the parameters */
    assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
    assert_param(IS_GET_GPIO_PIN(GPIO_Pin));
  
    if ((GPIOx->ODR & GPIO_Pin) != (uint32_t)Bit_RESET)
    {
      bitstatus = (uint8_t)Bit_SET;
    }
    else
    {
      bitstatus = (uint8_t)Bit_RESET;
    }
    return bitstatus;
  }
  
  /**
    * @brief  Reads the specified GPIO output data port.
    * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral.
    * @retval GPIO output data port value.
    */
  uint16_t GPIO_ReadOutputData(GPIO_TypeDef* GPIOx)
  {
    /* Check the parameters */
    assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
  
    return ((uint16_t)GPIOx->ODR);
  }
  
  /**
    * @brief  Sets the selected data port bits.
    * @note   This functions uses GPIOx_BSRR register to allow atomic read/modify 
    *         accesses. In this way, there is no risk of an IRQ occurring between
    *         the read and the modify access.
    * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral.
    * @param  GPIO_Pin: specifies the port bits to be written.
    *          This parameter can be any combination of GPIO_Pin_x where x can be (0..15).
    * @retval None
    */
  void GPIO_SetBits(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
  {
    /* Check the parameters */
    assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
    assert_param(IS_GPIO_PIN(GPIO_Pin));
  
    GPIOx->BSRRL = GPIO_Pin;
  }
  
  /**
    * @brief  Clears the selected data port bits.
    * @note   This functions uses GPIOx_BSRR register to allow atomic read/modify 
    *         accesses. In this way, there is no risk of an IRQ occurring between
    *         the read and the modify access.
    * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral.
    * @param  GPIO_Pin: specifies the port bits to be written.
    *          This parameter can be any combination of GPIO_Pin_x where x can be (0..15).
    * @retval None
    */
  void GPIO_ResetBits(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
  {
    /* Check the parameters */
    assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
    assert_param(IS_GPIO_PIN(GPIO_Pin));
  
    GPIOx->BSRRH = GPIO_Pin;
  }
  
  /**
    * @brief  Sets or clears the selected data port bit.
    * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral.
    * @param  GPIO_Pin: specifies the port bit to be written.
    *          This parameter can be one of GPIO_Pin_x where x can be (0..15).
    * @param  BitVal: specifies the value to be written to the selected bit.
    *          This parameter can be one of the BitAction enum values:
    *            @arg Bit_RESET: to clear the port pin
    *            @arg Bit_SET: to set the port pin
    * @retval None
    */
  void GPIO_WriteBit(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin, BitAction BitVal)
  {
    /* Check the parameters */
    assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
    assert_param(IS_GET_GPIO_PIN(GPIO_Pin));
    assert_param(IS_GPIO_BIT_ACTION(BitVal));
  
    if (BitVal != Bit_RESET)
    {
      GPIOx->BSRRL = GPIO_Pin;
    }
    else
    {
      GPIOx->BSRRH = GPIO_Pin ;
    }
  }
  
  /**
    * @brief  Writes data to the specified GPIO data port.
    * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral.
    * @param  PortVal: specifies the value to be written to the port output data register.
    * @retval None
    */
  void GPIO_Write(GPIO_TypeDef* GPIOx, uint16_t PortVal)
  {
    /* Check the parameters */
    assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
  
    GPIOx->ODR = PortVal;
  }
  
  /**
    * @brief  Toggles the specified GPIO pins..
    * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral.
    * @param  GPIO_Pin: Specifies the pins to be toggled.
    * @retval None
    */
  void GPIO_ToggleBits(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
  {
    /* Check the parameters */
    assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
  
    GPIOx->ODR ^= GPIO_Pin;
  }
  
  /**
    * @}
    */
  
  /** @defgroup GPIO_Group3 GPIO Alternate functions configuration function
   *  @brief   GPIO Alternate functions configuration function
   *
  @verbatim   
   ===============================================================================
                 GPIO Alternate functions configuration function
   ===============================================================================  
  
  @endverbatim
    * @{
    */
  
  /**
    * @brief  Changes the mapping of the specified pin.
    * @param  GPIOx: where x can be (A..I) to select the GPIO peripheral.
    * @param  GPIO_PinSource: specifies the pin for the Alternate function.
    *         This parameter can be GPIO_PinSourcex where x can be (0..15).
    * @param  GPIO_AFSelection: selects the pin to used as Alternate function.
    *          This parameter can be one of the following values:
    *            @arg GPIO_AF_RTC_50Hz: Connect RTC_50Hz pin to AF0 (default after reset) 
    *            @arg GPIO_AF_MCO: Connect MCO pin (MCO1 and MCO2) to AF0 (default after reset) 
    *            @arg GPIO_AF_TAMPER: Connect TAMPER pins (TAMPER_1 and TAMPER_2) to AF0 (default after reset) 
    *            @arg GPIO_AF_SWJ: Connect SWJ pins (SWD and JTAG)to AF0 (default after reset) 
    *            @arg GPIO_AF_TRACE: Connect TRACE pins to AF0 (default after reset)
    *            @arg GPIO_AF_TIM1: Connect TIM1 pins to AF1
    *            @arg GPIO_AF_TIM2: Connect TIM2 pins to AF1
    *            @arg GPIO_AF_TIM3: Connect TIM3 pins to AF2
    *            @arg GPIO_AF_TIM4: Connect TIM4 pins to AF2
    *            @arg GPIO_AF_TIM5: Connect TIM5 pins to AF2
    *            @arg GPIO_AF_TIM8: Connect TIM8 pins to AF3
    *            @arg GPIO_AF_TIM9: Connect TIM9 pins to AF3
    *            @arg GPIO_AF_TIM10: Connect TIM10 pins to AF3
    *            @arg GPIO_AF_TIM11: Connect TIM11 pins to AF3
    *            @arg GPIO_AF_I2C1: Connect I2C1 pins to AF4
    *            @arg GPIO_AF_I2C2: Connect I2C2 pins to AF4
    *            @arg GPIO_AF_I2C3: Connect I2C3 pins to AF4
    *            @arg GPIO_AF_SPI1: Connect SPI1 pins to AF5
    *            @arg GPIO_AF_SPI2: Connect SPI2/I2S2 pins to AF5
    *            @arg GPIO_AF_SPI3: Connect SPI3/I2S3 pins to AF6
    *            @arg GPIO_AF_USART1: Connect USART1 pins to AF7
    *            @arg GPIO_AF_USART2: Connect USART2 pins to AF7
    *            @arg GPIO_AF_USART3: Connect USART3 pins to AF7
    *            @arg GPIO_AF_UART4: Connect UART4 pins to AF8
    *            @arg GPIO_AF_UART5: Connect UART5 pins to AF8
    *            @arg GPIO_AF_USART6: Connect USART6 pins to AF8
    *            @arg GPIO_AF_CAN1: Connect CAN1 pins to AF9
    *            @arg GPIO_AF_CAN2: Connect CAN2 pins to AF9
    *            @arg GPIO_AF_TIM12: Connect TIM12 pins to AF9
    *            @arg GPIO_AF_TIM13: Connect TIM13 pins to AF9
    *            @arg GPIO_AF_TIM14: Connect TIM14 pins to AF9
    *            @arg GPIO_AF_OTG_FS: Connect OTG_FS pins to AF10
    *            @arg GPIO_AF_OTG_HS: Connect OTG_HS pins to AF10
    *            @arg GPIO_AF_ETH: Connect ETHERNET pins to AF11
    *            @arg GPIO_AF_FSMC: Connect FSMC pins to AF12
    *            @arg GPIO_AF_OTG_HS_FS: Connect OTG HS (configured in FS) pins to AF12
    *            @arg GPIO_AF_SDIO: Connect SDIO pins to AF12
    *            @arg GPIO_AF_DCMI: Connect DCMI pins to AF13
    *            @arg GPIO_AF_EVENTOUT: Connect EVENTOUT pins to AF15
    * @retval None
    */
  void GPIO_PinAFConfig(GPIO_TypeDef* GPIOx, uint16_t GPIO_PinSource, uint8_t GPIO_AF)
  {
    uint32_t temp = 0x00;
    uint32_t temp_2 = 0x00;
    
    /* Check the parameters */
    assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
    assert_param(IS_GPIO_PIN_SOURCE(GPIO_PinSource));
    assert_param(IS_GPIO_AF(GPIO_AF));
    
    temp = ((uint32_t)(GPIO_AF) << ((uint32_t)((uint32_t)GPIO_PinSource & (uint32_t)0x07) * 4)) ;
    GPIOx->AFR[GPIO_PinSource >> 0x03] &= ~((uint32_t)0xF << ((uint32_t)((uint32_t)GPIO_PinSource & (uint32_t)0x07) * 4)) ;
    temp_2 = GPIOx->AFR[GPIO_PinSource >> 0x03] | temp;
    GPIOx->AFR[GPIO_PinSource >> 0x03] = temp_2;
  }
  
  /**
    * @}
    */ 
  
  /**
    * @}
    */
  
  /**
    * @}
    */ 
  
  /**
    * @}
    */ 
  
  /******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/
  